Hydraulic jack for well-casings.



Alr G.STEWART. HYDRAULIC JACK FOR WELL CASINGS. l l APPLIoATIoN FILED 211.15, 1912. 1, 1 00,204, Patented June 16, 1914. y z SHEETS-SHEET 1.

M l 1- f 2 1,

Ifnfll.111.1111101: lhhrllml www@ j 1 i n a" 6in/ve nlm/f'- @fum 1 I G'Qffewu 6,9m m

A. o. STEWART. HYDRAULIC JACK'FOR WELL GASINGS.

I APPLICATION FILED FEBLS! 1912..

1,100,204, Patented June 16, 1914.

2 SHEETS-SHEET 2.

N 0J 9 8 s 4 1/ i l J I Z Z, 7 i mu 1 Il! l I if;

uf/55.1547547111 i! continuous tube which is lowered into the ll'means for positivelv .i-'zm'z y ALFRED C. STEWART, 0F LOS .Albl'G-ELES, CALIFORNIA.

mulino :rack ron. waLL-casrivos;

Specification of Letters lufatent.

Application med February e, i912. serial No. 675,863.

To all lwhom it may concern Be it known that I, Amann C. STEWART, a citizen of the United States,`resid`ing at Los Angeles, in the county of-Ls Angeles and State of California, have invented a new and useful Hydraulic Jack for Well- Oasings, of which the following is a specifif cation.

The main object of the present invention is to provide means for giving a ositive definite feed to the drilling tool o a well drilling machine.

A further object of the invention is to provide improved means for raising or lowering the drilling or well casing.

A further obJet of the inventionV is to provide improved' means vfor operating the elevator and gri ing devices to enable the attachment of a ditional sections of the cas inl f k(ther objects of the invention will appear hereinafter.

The accompanyin embodiment of the invention, thereto: i

Figure 1 is a vertical section of., the apparatus. Fig. 2 is a plan of the ap aratus' partly in section, on line :v2-:v2 in ig. 1. Fig. 3 is asection of aportion of the apparatus showing position of the parts for at tathment of a new section of casing.

and referring The invention is. shown as ada. ted for use in connection with a rotary dri lin rig such as shown in my application, Seria No. 665,390, filed vDecember 6th, `1911. Some features of the' invention are, however, ap-

plicableto any rotary or other drilling ri'g The well casing consists of a number' of sections 1, connected by collars 2, to forma ground as the drilling proceeds, and the main purpose of the invention is to provide feeding this casin downwardly at a efinite rate of-ispee Thiscasing may be the usual well casing, or; as shown in my former application, it may form the support for the drilling tool, lso that as the said casin is forced downwardly, the drilling tool is a so forced downwardliy, thereby giving a positive"l feed to thedri Thus in Fig. 1, t at'4 ismounted on thelowenend of thegcasing 1, and is adapted to be operated by a,

`which it lclosey surrounds thev casin drawings illustrate anv Fig. 4 is a side elevation, partly broken away, of. thecontrollin valve. Fig. 5 is a section on L e drilling tool indicated' shaft d extending verticallywithin the cas- Aing 1, and provided with driving means hereinafter set forth. A gripping 'means 7` for engag1ng the casing 1s provided, consisting, for example, of two half-ring meml 'Patented June 16,1914. a

bers adapted to vembrace the casing sections 1 and connected to suspending links 8, in the usual manner of`a casing elevator, so as to hold the said ripping means in position in sections 1 and'extendsbeneath the top co lar 2 thereon. An upper ring 10l may be provided, engaging with thetop of the said top collar 2 and connected to the ripping means 7 by bolts 11, so as to grip t l and 10, and connect the casing to the grip ing means for both upward and downwar' op'- erations of the gripping means.

Hydraulically operated means are provided for raising and lowering the gripping means For this purpose a piston rod 12 is (provided at each side of the well casing an 1s connected to a piston 1 3 slidable vertically in a cylinder 14, said piston rod being provided with means for engaging the empale are rigi ly mounted in the base 3 of the apparatus. In order to enable the piston rod to be operated independently ofsaid gripping means when desired, a detachable conn ection is provided, consisting of a yoke 18 having upper and lower slotted heads 119 ada ted to embrace a reduced portion 2O of sai piston`rod, and to engage respectively,

a head 21 on the upper end ofthe piston rod,

and a shoulder 22 on said piston rod. Said reduced lportion 20 of said vpiston rod extends through a vertical channel 24 in the ping \me mber l7, said channel being of su cient diameter" to enable free passage of the piston rod therethrough, when the yoke' 1' 8.is removed.

Pipes 26 and 27 lead respectively' from the upper and lower part of each cylinder 14 t0,p0rts 28 and29 in a valve casing 30, said valve casing being provided with two other orts' 31 and 32 communicating respectively pi es 3l and"32 with the inlet and outlet o .a pump 33,. operated by a rshaftd34 journaled in bearings 34 and provided-with suitable drivin means such as stepped ley 35. TheI p u .36 of the aforesaid'valve is rovided witg` an operating handle 37 andi has internal passages 38 and 39 for es; tablishing communication between the seve said to col- V r.lar tightly between the said members means 7 aforesaid. Cylinders 14 Pulleral ports aforesaid, as hereinafter set forth, and is also provided with a passage 40 for establishing communication between the port 29 and a port 42 in the Valve casing 30, said port 42 communicating through pipe 43 with a pipe 44 leading to a tank 45. Said tank 45 is normally supplied with operating liquid by means of a pump 48 pump ing oil into pipe 44 from a pipe 49 leading to a reserve tank 50.

The operation is as follows: Assuming that the casing is in place in the well and that it is gripped by the gripping means 7, which is connected to the piston rods 12 by the yoke means 18, the drilling may proceed by rotation of the shaft 5. The rotation of said shaft 5 operates the drilling means 4 at the bottom of the casing, and as the drilling proceeds, the casing is lowered, so as to fee t-he drilllng tools positively by operation of the hydraulic means. In this operation the valve plug is turned to position shown in full lines in Fig. 6, so that liquid is forced by pump 33 through pipe 3 port ,32, passage 39 of the valve plug 6, to port 28 pipe 26 to the top of each cylinder 14, an from the lower part of each cylinder 14 the liquid passes through pipe 27, port 29, passage 38, in the valve plug, port 31 and pipe 31, back to the intake of the pump 33. The operation of the pump .33 by the driving means 35 therefore produces a -gradual,

positive, downward feed of the pistons 13,

the p iston rods 12 connected thereto, theV gripping means 7, the casingl and the drilling means 4 at the bottom of the casing. If, on the other hand, it is desired to withdraw the casing, the operation isreversed by turning the valve plug 36 to position, in which passage 38 communicates with ports 31 and 28and assage 39 communicates with ports 29 hud 2, thereby reversing `the connection ofV the pump 33 to the cylinders 14 and causing the liquid .from the ump 33 to be forced into the lower part oi) the cylinders and lwithdrawn from the uppler part of the cylinders, therebyraising t e pistons 13, piston rods 12, gripping means 7 and the casing. Innormal operation, the pump 48 forces the liquid from the reserveir 50 to the pressure tank 45 lwhich is located at con- 'siderablelheighn for ezaniple, at the upper part of t e derrick. When' it is desired to add a` new section ofasing, the gripping means 7 is lowered with the casing until it rests on a part 73: of base 3, beneath the .same and the connecting\yokes 18 are then knocked out, leaving 'the gripping means free of the piston rods 12. Another casing section is then screwed into the collar 2 at the upper end of the casing already in place and another collar 2 is screwed onto the casing section so placed. Another gripping means 7 is then placed around the casing,

below the topmost collar with its channels 24 lto operate said directly above t-he piston rods 12. The valve plug 36 is then turned to position in which the passage 40 therein comes into register at one end with t-he port 29, and at the other end with the port 42, communicating with the pressure tank 45, through pipe 44. The liquid will then run from said pressure tank 45 t-o the lower part of the cylinders 14 causing the pistons in said cylinders to rise rapidly to the upper end of their stroke and raising the upper ends of the piston rods 12 to an extent substantially equally to the lengthof one casing section as shown in Fig. 4, and when the piston rods are forced upwardly as stated their upper ends pass through the channels 24 in the upper gripping member 7 and the connecting yokes 18 may then be driven into place so as to engage with the heads 21 and shoulders 22 on the piston rods' 12 and with the gripping means 7 to firmly connect said parts. The apparatus is then ready for another lowering operation. It will be understood that in case the rotary drilling apparatus with the central shaft 5 is employed, the shaft must be disconnected during this operation.

What l claim is:

1. The combination of casing gppin means, cylinder and piston means connect to operate said gripping means vertically, means for supplyin liquid to said cylinder and piston means or raising or lowering said gripping means, and means detachably connecting said piston means with said casing gripping means to enable operation of e .casing gripping means by the piston means when connected thereto and to permit the piston means to be raised independently of said gripping means for the purpose set forth.

2. The combination of casing grippin means, cylinder and piston means connected gripping means vertically,

means for supplying fluid to cylinder and piston means for raising and lowering said 110 gripping means, means detachably connecting said iston means withsaid casing gri ping means to enable operation of the casing gripping means by the piston means when connected thereto, and to permit the 115 piston means to be raised independently of said ripping means, and means independent of the aforesaid Huid supply means for supplying Huid to the said cylinder and piston means when the piston meansiis discon- 120 nected from the casing gripping means.

3. The combination of casing gripping means, cylinder and piston means connected to operate said casing means vertically, a pump and a valve connected thereto and to 125 said cylinder and ,piston means to supply liquid from said pump to said cylinder and piston means for .raising or lowering said gripping means byroperation of the pump, a pressure tank, means supplying liquid tc 180 said pressure tank, and valve controlled of said gripping means for the purpose set communicating means from said pressure forth. tank to said cylinder and piston means to 1 lIn testimony whereof, I have hereunto Set -cause said piston means to be raised by j my hand at Los Angeles, California this 5 liquid from said tank, and means detachably i 29th day of January, 1912.

connecting said piston means with said cas- ALFRED C STEWART ing gripping means, to enable operation of the casing gripping means ,by the piston 3 In presence of means when connected thereto and to permit l ARTHUR P. KNIGHT, 10 the piston means to be raised independently I GLADYS RUSSELL. 

